1#!/bin/sh
2# Check open filename arg using perf trace + vfs_getname
3
4# Uses the 'perf test shell' library to add probe:vfs_getname to the system
5# then use it with 'perf trace' using 'touch' to write to a temp file, then
6# checks that that was captured by the vfs_getname was used by 'perf trace',
7# that already handles "probe:vfs_getname" if present, and used in the
8# "open" syscall "filename" argument beautifier.
9
10# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
11
12. $(dirname $0)/lib/probe.sh
13
14skip_if_no_perf_probe || exit 2
15skip_if_no_perf_trace || exit 2
16
17. $(dirname $0)/lib/probe_vfs_getname.sh
18
19file=$(mktemp /tmp/temporary_file.XXXXX)
20
21trace_open_vfs_getname() {
22	evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
23	perf trace -e $evts touch $file 2>&1 | \
24	egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
25}
26
27
28add_probe_vfs_getname || skip_if_no_debuginfo
29err=$?
30if [ $err -ne 0 ] ; then
31	exit $err
32fi
33
34trace_open_vfs_getname
35err=$?
36rm -f ${file}
37cleanup_probe_vfs_getname
38exit $err
39